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	<title>jQuery plugin: Tablesorter 2.0 - Writing custom widgets</title>
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	$(function() {
		// add new widget called repeatHeaders
		$.tablesorter.addWidget({
			// give the widget a id
			id: "repeatHeaders",
			// format is called when the on init and when a sorting has finished
			format: function(table) {
				// cache and collect all TH headers
				if(!this.headers) {
					var h = this.headers = []; 
					$("thead th",table).each(function() {
						h.push(
							"<th>" + $(this).text() + "</th>"
						);
						
					});
				}
				
				// remove appended headers by classname.
				$("tr.repated-header",table).remove();
				
				// loop all tr elements and insert a copy of the "headers"	
				for(var i=0; i < table.tBodies[0].rows.length; i++) {
					// insert a copy of the table head every 10th row
					if((i%5) == 4) {
						$("tbody tr:eq(" + i + ")",table).before(
							$("<tr></tr>").addClass("repated-header").html(this.headers.join(""))
						
						);	
					}
				}
				
			}
		});
		
		// call the tablesorter plugin and assign widgets with id "zebra" (Default widget in the core) and the newly created "repeatHeaders"
		$("table").tablesorter({
			widgets: ['zebra','repeatHeaders']
		});

	}); 		
	</script>
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<body>
<div id="banner">	
	<h1>table<em>sorter</em></h1>
	<h2>Writing custom widgets</h2>
	<h3>Flexible client-side table sorting</h3>
	<a href="index.html">Back to documentation</a>
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<h1>Javascript</h1>
<pre class="javascript">
// add new widget called repeatHeaders
$.tablesorter.addWidget({
	// give the widget a id
	id: "repeatHeaders",
	// format is called when the on init and when a sorting has finished
	format: function(table) {
		// cache and collect all TH headers
		if(!this.headers) {
			var h = this.headers = []; 
			$("thead th",table).each(function() {
				h.push(
					"<th>" + $(this).text() + "</th>"
				);
				
			});
		}
		
		// remove appended headers by classname.
		$("tr.repated-header",table).remove();
		
		// loop all tr elements and insert a copy of the "headers"	
		for(var i=0; i < table.tBodies[0].rows.length; i++) {
			// insert a copy of the table head every 10th row
			if((i%5) == 4) {
				$("tbody tr:eq(" + i + ")",table).before(
					$("<tr></tr>").html(this.headers.join(""))
				
				);	
			}
		}
	}
});

// call the tablesorter plugin and assign widgets with id "zebra" (Default widget in the core) and the newly created "repeatHeaders"
$("table").tablesorter({
	widgets: ['zebra','repeatHeaders']
});
</pre>

<h1>Demo</h1>
<table cellspacing="1" class="tablesorter">
	<thead>
		<tr>
			<th>Name</th>
			<th>Major</th>
			<th>Sex</th>
			<th>English</th>
			<th>Japanese</th>
			<th>Calculus</th>
			<th>Geometry</th>

		</tr>
	</thead>
	<tfoot>
		<tr>
			<th>Name</th>
			<th>Major</th>
			<th>Sex</th>
			<th>English</th>
			<th>Japanese</th>
			<th>Calculus</th>
			<th>Geometry</th>

		</tr>
	</tfoot>
	<tbody>
		<tr>
			<td>Student01</td>
			<td>Languages</td>
			<td>male</td>

			<td>80</td>
			<td>70</td>
			<td>75</td>
			<td>80</td>
		</tr>
		<tr>
			<td>Student02</td>

			<td>Mathematics</td>
			<td>male</td>
			<td>90</td>
			<td>88</td>
			<td>100</td>
			<td>90</td>

		</tr>
		<tr>
			<td>Student03</td>
			<td>Languages</td>
			<td>female</td>
			<td>85</td>
			<td>95</td>

			<td>80</td>
			<td>85</td>
		</tr>
		<tr>
			<td>Student04</td>
			<td>Languages</td>
			<td>male</td>

			<td>60</td>
			<td>55</td>
			<td>100</td>
			<td>100</td>
		</tr>
		<tr>
			<td>Student05</td>

			<td>Languages</td>
			<td>female</td>
			<td>68</td>
			<td>80</td>
			<td>95</td>
			<td>80</td>

		</tr>
		<tr>
			<td>Student06</td>
			<td>Mathematics</td>
			<td>male</td>
			<td>100</td>
			<td>99</td>

			<td>100</td>
			<td>90</td>
		</tr>
		<tr>
			<td>Student07</td>
			<td>Mathematics</td>
			<td>male</td>

			<td>85</td>
			<td>68</td>
			<td>90</td>
			<td>90</td>
		</tr>
		<tr>
			<td>Student08</td>

			<td>Languages</td>
			<td>male</td>
			<td>100</td>
			<td>90</td>
			<td>90</td>
			<td>85</td>

		</tr>
		<tr>
			<td>Student09</td>
			<td>Mathematics</td>
			<td>male</td>
			<td>80</td>
			<td>50</td>

			<td>65</td>
			<td>75</td>
		</tr>
		<tr>
			<td>Student10</td>
			<td>Languages</td>
			<td>male</td>

			<td>85</td>
			<td>100</td>
			<td>100</td>
			<td>90</td>
		</tr>
		<tr>
			<td>Student11</td>

			<td>Languages</td>
			<td>male</td>
			<td>86</td>
			<td>85</td>
			<td>100</td>
			<td>100</td>

		</tr>
		<tr>
			<td>Student12</td>
			<td>Mathematics</td>
			<td>female</td>
			<td>100</td>
			<td>75</td>

			<td>70</td>
			<td>85</td>
		</tr>
		<tr>
			<td>Student13</td>
			<td>Languages</td>
			<td>female</td>

			<td>100</td>
			<td>80</td>
			<td>100</td>
			<td>90</td>
		</tr>
		<tr>
			<td>Student14</td>

			<td>Languages</td>
			<td>female</td>
			<td>50</td>
			<td>45</td>
			<td>55</td>
			<td>90</td>

		</tr>
		<tr>
			<td>Student15</td>
			<td>Languages</td>
			<td>male</td>
			<td>95</td>
			<td>35</td>

			<td>100</td>
			<td>90</td>
		</tr>
		<tr>
			<td>Student16</td>
			<td>Languages</td>
			<td>female</td>

			<td>100</td>
			<td>50</td>
			<td>30</td>
			<td>70</td>
		</tr>
		<tr>
			<td>Student17</td>

			<td>Languages</td>
			<td>female</td>
			<td>80</td>
			<td>100</td>
			<td>55</td>
			<td>65</td>

		</tr>
		<tr>
			<td>Student18</td>
			<td>Mathematics</td>
			<td>male</td>
			<td>30</td>
			<td>49</td>

			<td>55</td>
			<td>75</td>
		</tr>
		<tr>
			<td>Student19</td>
			<td>Languages</td>
			<td>male</td>

			<td>68</td>
			<td>90</td>
			<td>88</td>
			<td>70</td>
		</tr>
		<tr>
			<td>Student20</td>

			<td>Mathematics</td>
			<td>male</td>
			<td>40</td>
			<td>45</td>
			<td>40</td>
			<td>80</td>

		</tr>
		<tr>
			<td>Student21</td>
			<td>Languages</td>
			<td>male</td>
			<td>50</td>
			<td>45</td>

			<td>100</td>
			<td>100</td>
		</tr>
		<tr>
			<td>Student22</td>
			<td>Mathematics</td>
			<td>male</td>

			<td>100</td>
			<td>99</td>
			<td>100</td>
			<td>90</td>
		</tr>
		<tr>
			<td>Student23</td>

			<td>Languages</td>
			<td>female</td>
			<td>85</td>
			<td>80</td>
			<td>80</td>
			<td>80</td>

		</tr>
	</tbody>
</table>
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